This is explained in the GLA report which says, despite Southwark’s insistence that the development could provide more affordable housing, that the viability of the scheme means that only 10 S/O homes can be viably provided.
It also says that the low affordable housing provision (5.9%) is justified because the development is cross-subsidising the free school.

The officers report also says that Council didn’t agree the assumptions in the viability assessment..

Section 106 agreement says that the total contribution made towards new local transport infrastructure is £88,546.